Roy T. Hazzard books & textbook
Geology of Big Bend National Park, Brewster County, Texas
Ross A. Maxwell John T. Lonsdale Roy T. Hazzard John A. Wilson
University of Texas /1967T Paperback
West Texas Geological Society Guidebook 1955 Spring Field Trip: Big Bend National Park, Texas; March 18-19, 1955
John T. Lonsdale Ross A. Maxwell John A. Wilson Roy T. Hazzard
West TX Geological Society /1955-01-01 Spiral-bound / 142 Pages
Geology of the Val Verde Basin and Field Trip Guidebook, November 5,6,7,8, 1959.
Cannon, R. L., Roy T. Hazzard, Addison Young, & Keith P. Young. (Trip leaders)
West Texas Geological society /1959T Hardcover
